Method and apparatus for non-model based decentralized adaptive feedforward active vibration control
First Claim
1. An active vibration control system for attachment to, and controlling dynamic vibration of, a vibrating member, said dynamic vibration being caused by a primary vibration source, comprising:
- (a) at least one actively-driven element for attachment to said vibrating member at an attachment point;
(b) a collocated error sensor for providing an error signal indicative of residual dynamic vibration at a point substantially adjacent to said attachment point on said vibrating member;
(c) a reference sensor for providing a reference signal which is correlated to a frequency content of, said primary vibration source; and
(d) an electronic controller for adaptively calculating an updated output signal which is derived from said reference signal and said error signal based upon a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA) and providing said updated output signal to said at least one actively-driven element thereby causing said residual dynamic vibration at said attachment point to be reduced in one selected from a group consisting of a broadband and tonal fashion.
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Abstract
A method and system/apparatus implementing a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA) for active vibration control of an actively-driven element, such as an Active Vibration Absorber (AVA) (24). The AVA (24)preferably includes an inertial tuning mass (42) and a voice coil assembly (46) and is contained in an active vibration control system (20) wherein the method and system/apparatus reduce vibration of a vibrating member (22) at an attachment point (26) by receiving an error signal from an error sensor (28) such as an accelerometer and a reference signal from a tachometer (32) or accelerometer (34), where the reference signal is correlated to, or indicative of the frequency content of, a primary vibration source (36) and calculating an updated output signal via an electronic controller (39) using the non-model based DFAA to dynamically drive the actively-driven element, such as AVA (24). The method and system/apparatus using DFAA is effective for reduction of both tonal and broadband vibration. The method approaches the performance of Filtered-x LMS control, yet is decentralized and does not require information regarding the plant.
86 Citations
20 Claims
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1. An active vibration control system for attachment to, and controlling dynamic vibration of, a vibrating member, said dynamic vibration being caused by a primary vibration source, comprising:
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(a) at least one actively-driven element for attachment to said vibrating member at an attachment point; (b) a collocated error sensor for providing an error signal indicative of residual dynamic vibration at a point substantially adjacent to said attachment point on said vibrating member; (c) a reference sensor for providing a reference signal which is correlated to a frequency content of, said primary vibration source; and (d) an electronic controller for adaptively calculating an updated output signal which is derived from said reference signal and said error signal based upon a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA) and providing said updated output signal to said at least one actively-driven element thereby causing said residual dynamic vibration at said attachment point to be reduced in one selected from a group consisting of a broadband and tonal fashion. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of reducing dynamic vibration at an attachment point on a vibrating member, said dynamic vibration being generated at said attachment point by a primary vibration source, comprising:
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(a) attaching at least one actively-driven element to said attachment point on said vibrating member; (b) providing an error signal indicative of residual dynamic vibration at a point substantially adjacent to said attachment point from an error sensor which is substantially collocated at said attachment point; (c) providing a reference signal from a reference sensor which is correlated to a frequency of, said primary vibration source; (d) calculating in an electronic controller an updated output signal which is derived from said reference signal and said error signal based upon a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA); and (e) providing said updated output signal to actively drive said at least one actively-driven element and thereby produce dynamic forces which cause said residual dynamic vibration at said attachment point on said vibrating member to be reduced in one selected from a group consisting of a broadband and a tonal fashion. - View Dependent Claims (8, 9, 10, 11, 12)
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13. In an active vibration control system including an actively-driven element, an error sensor, and a reference sensor, a control method for reducing dynamic vibration at an attachment point of a vibrating member, comprising the steps of:
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(a) obtaining α
which is a positive real scalar between 0 and 1 which affects convergence and steady state solution;(b) obtaining u(k) which is a complex quantity representative of magnitude and phase of an output signal to said actively-driven element at an operating frequency (fo) at a kth iteration; (c) obtaining μ
which represents a positive real convergence factor which controls a convergence speed of said control method;(d) obtaining b which represents a complex constant whose value is dependent upon characteristics of said driven element and said error sensor in said active vibration control system; (e) obtaining e(k) which is a complex value representative of magnitude and phase of said error sensor which measures residual vibration at said attachment point substantially collocated with said actively-driven element at said operating frequency (fo) at said kth iteration; (f) calculating according to a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA), an updated output signal u(k+1) which is a complex quantity representative of magnitude and phase of said updated output signal at said operating frequency (fo) at a (k+1)th iteration according to an equation u(k+1)=α
u(k)-μ
b e(k); and(g) providing said updated output signal to said actively-driven element to drive said actively-driven element and produce active forces which reduce said dynamic vibration at said attachment point in a tonal fashion at said operating frequency (fo). - View Dependent Claims (14, 15, 16)
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17. In an active vibration control system including an actively-driven element, an error sensor, and a reference sensor, a control method for reducing dynamic vibration at an attachment point on a member, comprising the steps of:
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(a) obtaining α
which is a positive real scalar which affects convergence and steady state solution;(b) obtaining W(k) which is a vector of values of filter coefficients for an adaptive filter whose input is comprised of a reference signal which is correlated to a primary vibration source, and whose output comprises an output signal to said actively-driven element at a kth time sample; (c) obtaining μ
which represents a positive real scalar convergence factor which controls a convergence speed of said control method;(d) obtaining e(k) which is an error signal from said error sensor which measures said dynamic vibration at said attachment point at a point substantially collocated with said actively-driven element at said kth time sample; (e) obtaining Z(k) which is a vector quantity and represents an output signal from a filter whose input is said reference signal which is correlated to said primary vibration source and said filter has design parameters which are dependent upon characteristics of said actively-driven element and said error signal; (f) calculating according to a non-model based Decentralized Feedforward Adaptive Algorithm (DFAA), W(k+1) which is an updated vector of values of filter coefficients for said adaptive filter whose input is comprised of a reference signal which is correlated to said primary vibration source, and whose output comprises an updated output signal to said actively-driven element at a (k+1)th time sample according to an equation W(k+1)=α
W(k)-μ
e(k) Z(k); and(g) driving said actively-driven element according to said updated output signal to produce dynamic forces and reduce dynamic vibration at said attachment point within a particular broadband frequency range of said primary vibration source. - View Dependent Claims (18, 19, 20)
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Specification